8 C. SASAKI, 



leaves or approficliing tlie Luslies from some other places. In the latter 

 case, after wandermg about a while on the upper surface of leaves, they 

 pass on to the under surface, and there deposit their eggs in close 

 contact with the ramified veins, enveloping and gluing them with a 

 transparent glutinous substance ( PL I, fig. 11 ). The habit of thus 

 depositing the eggs on the under surf ice of the leaves was first noticed 

 by my father. That it is not accidental, but is a confirmed habit of the 

 species is positively proved by the fact that those eggs deposited on the 

 under surface of the leaves, not receiving the direct rays of the sun are 

 kept moist, and remain alive many weeks after tliey are deposited, while 

 the eggs not in this position receiving the direct rays of the sun, soon 

 dry up, and die. There is olso the further advantage that their position 

 on the under surface of the leaf protects them from the effects of rain. 

 If the eggs are deposited on spots on which the rain beats direotly, the 

 glutinous substance which attaches them to the leaf softens or liquefies 

 by the action of the rain-water, and the egg'é drop to the ground. 



II. 



Sexual and Other Internal organs of the Adult Fly. 



The male organ is composed of testes, vasa defcrcntia, seminal 

 reservoirs and penis ( P/. i7, fig. 1 ). The testes ( rt ) which are two in 

 number are pear-shaped, and white in color. From each testis extends 

 a single delicate slender tube, the vas deferens (?>), which extending 

 posteriorly a short distance unites with its fellow of the opposite side, 

 and opens into a common tube ( & ). This passing straight backwards 

 ends in a penis (c). At the junction of the vasa deferentia of two 

 sides, there arc placed side by side two seminal reservoirs (/i.) having 



